JPH091678A - Push-button switch device and housing therefor - Google Patents

Abstract

PURPOSE: To provide a bush-button switch device which provides high degree of freedom in design, can be easily manufactured by the small number of parts and a simple process, has excellent operation feeling, and can provide excellent reliability. CONSTITUTION: In a case 10 made of a resin having an opening 11, a circuit board 20 having a switch section 21 is housed. A cover member 30 having a bulged part 30a is formed of a material having rubber elasticity such as an elastomer and a silicone rubber. The cover member 30 is attached to the inside of the case 10 in such a manner that the bulged part 30a faces the opening 11 and at least the whole periphery of the opening 11 is fixed. To the rear face of the bulged part 30a of the cover member 30, a switch contact member 32 which can butt against the switch section 21 is fixed by two-color molding or sticking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push button switch device used for a mobile phone, a car phone, a home electric appliance such as an electric washing machine and a flashlight, a remote controller or a device such as a handy terminal. The present invention relates to a push button switch device that is housed in a device case to form a push button switch, and a contact portion that comes into contact with a switch portion of a circuit board is made of a hard resin to improve an operational feeling.

[0002]

2. Description of the Related Art In general, a push button switch device for the above-mentioned equipment accommodates a circuit board provided with a switch portion in a housing formed by joining a plurality of cases and forms an opening in the case. A push button member is partially exposed at the opening of the case so as to be able to contact the switch section. The push button member is urged to the outside of the case by a spring or the like, and the switch section of the circuit board is pressed by pressing the push button member. Is configured to open and close. The case is called a half case, so-called half, and is formed of ABS resin or PC resin in consideration of lightness and cost.
Also, the push button member is a molded product of hard resin or a push button sheet in which a plurality of push button parts are integrally molded with a thermosetting resin elastic body such as silicone rubber is used. Is used in combination with a metal coil spring.

By the way, in the above-mentioned equipment, its structure is required to be waterproof and dustproof, and the push button switch device is also required to be waterproof and dustproof. Therefore, in such a push button switch device, when the push button member is molded from hard resin, a separately molded packing is provided on the externally exposed portion of the push button member to achieve a waterproof structure (for convenience, referred to as prior art 1). In addition, the push button sheet adopts a waterproof structure by pressing it against the case using an adhesive, a primer, or another member, or by adhering (for convenience, referred to as prior art 2).

However, the former prior art 1 described above
However, there is a problem that not only the structure becomes complicated, but also the number of parts increases and the manufacturing cost increases. Further, in the latter prior art 2, a large number of steps and man-hours are required for assembly, the productivity is low, the quality is not constant due to variations in assembly, and the reliability such as waterproofness is poor. Not only has, but also the outer shape of the case is restricted,
There was also the problem that the degree of freedom in product design was low.

On the other hand, as this type of push button switch, the push button switch device shown in FIG. 11 (referred to as prior art 3 for convenience) is conventionally known. As shown in FIG. 11, the push button switch device according to the related art 3 accommodates a circuit board 20 provided with a switch portion 21 in a case 10 having an opening 11 and is made of a rubber elastic material such as silicone rubber or elastomer. Cover member 30 made of elastic material
Is fixedly provided to the case 10 at the periphery of the opening 11. The cover member 30 is formed with a plurality of bulging portions 30a having a substantially trapezoidal cross section that bulges toward the outside.
A hard resin key top member 31 is fixed to the front surface of 0a, and a switch contact portion 32 is integrally formed on the back surface so as to correspond to the key top member 31.

In the push button switch device according to the above-mentioned prior art 3, when the operator presses the key top member 31, the cover member 30 is elastically deformed, and the switch contact member 32 comes into contact with the switch portion 21 of the circuit board 20. The circuit is opened and closed by the operator, and when the operator removes the finger from the key top member 31, the repulsive elasticity of the cover member 30 causes the key top member 31 to return to its original state. This push button switch device is highly waterproof and dustproof,
In addition, the degree of freedom in design is high, the number of parts is small, the structure is simple, and the structure can be achieved at a low cost.

[0007]

However, in the push button switch device according to the prior art 3, a clear sense of operating detent cannot be obtained, causing chattering, and
There is a drawback that it causes contact failure which is considered to be caused by insufficient pressing force. The present invention has been made in view of the above-mentioned problems of the prior art and the drawbacks, and has a high degree of freedom in design, a small number of parts, easy manufacturing with a simple process, excellent operation feeling, and high operation. It is an object of the present invention to provide a push button switch device that can achieve reliability.

[0008]

In order to achieve the above object, the invention according to claim 1 is a housing for a push button switch device in which a plurality of cases are joined and a plurality of openings are formed in at least one case. A cover main body made of a rubber elastic material is fixed to the case having the opening over at least the entire periphery of the opening, and a key top portion is provided on the front surface of the cover main body at the opening position, and the back surface of the cover main body is provided. A contact member made of hard resin was fixed at the opening position, and the projected area of the contact member in plan view was made smaller than the projected area of the key top portion in plan view.

According to a second aspect of the present invention, a circuit board having a switch portion is housed in a housing formed by joining a plurality of cases, and a switch portion of the circuit board faces at least one case. In the push button switch device having the opening, the circumference of the key top portion is fixed over the entire circumference of the opening edge portion of the case, and the surface has rubber elasticity having a key top portion protruding outward from the opening of the case. A cover body, and a contact member provided on the back surface of the cover body so as to be capable of contacting the switch portion of the circuit board at a position corresponding to the key top portion, and made of a hard resin having a projected area in plan view smaller than that of the key top portion. And

According to a third aspect of the invention, in the first and second aspects of the invention, the key top portion is integrally formed of the same hard resin as the contact member,
According to a fourth aspect of the present invention, in the first and second aspects of the present invention, at least one of the key top portion and the contact member is formed integrally with the case, particularly, the same hard resin. To be done. Particularly preferably, the above-mentioned contact member is configured so that its projected area is 1/2 or less of the projected area of the key top portion and smaller than the area of the contact surface of the switch portion of the circuit board. Here, "fixation" in the claims means a bond due to van der Waals forces of molecules, adhesion in a attracted state by exerting mutual hydrogen bond, adhesion, heat fusion, and
Includes cases such as mutual fitting.

The case, the cover body and the contact member, or the key top portion can be molded by ordinary injection molding or the like. Desirably, insert molding, or core rotation type or core back type multi-material injection is used. It is molded by two-color molding using a molding machine. A thermoplastic elastomer, silicone rubber, or the like is used as the elastic body having rubber elasticity that constitutes the cover body, and the thermoplastic elastomer includes polystyrene-based elastomer, polyolefin-based elastomer, polyurethane-based elastomer,
It is selected from polyester-based elastomer, polyamide-based elastomer, polybutadiene-based elastomer, polyvinyl chloride-based elastomer, fluororubber-based elastomer, chlorinated polyethylene-based elastomer, etc., and its properties such as hardness make click feeling and operation feeling appropriate. It is determined.

Further, as the hard resin, ABS, polycarbonate, methacrylic resin, polypropylene, polybutylene terephthalate, polyethylene terephthalate, polystyrene, polyamide, polyphenylene ether, polyphenylene sulfide, polyacetal, alloy of these resins, or the like is used. Furthermore, the case is made of a thermoplastic resin such as ABS, polycarbonate, methacrylic resin, polypropylene, polybutylene terephthalate, polyethylene terephthalate,
Polystyrene, polyamide, polyphenylene ether,
It is molded using polyphenylene sulfide, polyacetal or alloys of these resins.

[0013]

According to the first and second aspects of the present invention, since the cover body is fixed to the case over the entire circumference of the opening, high waterproofness and dustproofness are achieved. Further, since the cover body is elastically deformed by the pressing operation of the key top portion to obtain repulsion elasticity, a metal coil spring is not required, the simplification of the structure and the reduction of the number of parts are achieved, and the manufacturing cost is low and easy. In addition, since the contact member that comes into contact with the switch portion of the circuit board is formed of hard resin in a shape having a projected area smaller than that of the key top portion, it is possible to prevent inconvenience such as double pressing.

According to the push button switch device of the third aspect of the present invention, since the key top portion is integrally formed of the same hard resin as the contact member, a hard finger touch feeling can be obtained. In addition, the click feeling is easily transmitted to the operator, a better operation feeling is obtained, and the key top part and the contact member can be integrally formed with the cover member by two-color molding etc. at the same time, and the molding is easy. Is. Further, according to the push-button switch device of the fourth aspect of the present invention, at least one of the key top portion and the contact member is formed integrally with the case by molding the same hard resin. It can be molded integrally with the cover body by color molding, etc., and can be easily manufactured in a simpler process.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an enlarged sectional view of a part of a push button switch device according to a first embodiment of the present invention. It should be noted that the same parts as those of the push button switch device according to the related art shown in FIG.

As shown in FIG. 1, the case 10 has a plurality of openings 11, and a circuit board 20 and a cover member 30 are provided in the case 10. Case 10 is the ABS described above.
It is molded by injection molding using a thermoplastic resin such as, and as described above, the plurality of cases 10 are joined (fitted) to form a housing. The circuit board 20 has a surface (in FIG. 1,
On the upper surface), a plurality of switch parts 21 are provided with openings 11 of the case 10.
Is provided in correspondence with. The switch portion 21 is configured by mounting a contact 21b on the upper part of the switch body 21a so as to be vertically movable, and the contact 21b vertically moves by contact of a switch contact member described later to open and close a circuit.

Needless to say, the circuit board 20
The switch portion 21 is not limited to the above-mentioned structure, and its structure is determined in relation to the contact member described later. That is, for example, if the contact member is conductive, the switch portion 21 can be formed by a pair of electrodes or the like formed on the upper surface of the circuit board 20 so that the conductive contact member can be simultaneously contacted.

As described above, the cover member 30 is formed into a sheet shape by injection molding or the like from a thermoplastic elastomer having rubber elasticity, silicone rubber or the like, and a plurality of bulging portions (key tops) bulging upward in a spherical shape. Part) 30a is formed. This cover member 30 is provided for each key top portion 3
0a faces the opening 11 of the case 10 and is attached to the back surface of the case 10 by fixing at least the periphery of each key top portion 30a to the entire periphery of each opening 11 with an adhesive or the like.

Further, in the cover member 30, a substantially rod-shaped switch contact member 32 is provided on the back surface (concave side) of each key top portion 30a and the contact 2 of the switch portion 21 of the circuit board 20.
It is fixed so that it can come into contact with 1b. These switch contact members 32 are made of a hard material such as ABS (preferably, as described above).
Rockwell hardness R 70 degrees or more and 140 degrees or less, or
It is made of a thermoplastic resin having a Shore D hardness of 40 degrees or more and 90 degrees or less), and its projected area S in plan view is smaller than the projected area Sa in plan view of the key top portion 30a (preferably 1/2 or less), and is in contact. Plane projection area Sb of the upper surface of the child 21b
It has a smaller shape. This switch contact member 32
Is integrally fixed to the cover member 30 by two-color molding or the like.

In the push button switch device of the first embodiment, the operator operates the key top portion 30 of the cover member 30.
By pressing a, the cover member 30 elastically deforms,
The switch contact member 32 is the switch portion 21 of the circuit board 20.
Contacting the contact 21b of the above to activate the switch portion 21,
When the operator's finger separates from the key top portion 30a, the original state (the state shown in the figure) is restored due to the impact resilience of the cover member 30. Here, in this push button switch device, the switch contact member 32 that comes into contact with the contact 21b of the switch portion 21 is made of a hard resin, and its repulsive elasticity is covered by the cover member 3.
Since it is obtained by the elastic deformation of 0, a clear operation detent (click) can be obtained, the switch portion 21 can be operated reliably, and the projected area S of the switch contact member 32 is the projected area Sa of the key top portion 30a. And contact 21b
Since it is smaller than the projected area Sb of, it is possible to prevent double pressing.

Further, in this push button switch device, since the cover member 30 is fixed to the case 10 over the entire circumference of the opening 11, it is possible to prevent water from entering the case 10 through the opening 11 and have high waterproofness. And dust resistance are achieved. Further, this push button switch device, as described above,
In order to obtain impact resilience due to elastic deformation of the cover member 30,
Since metal coil springs and the like are not required, the structure can be simplified and the number of parts can be reduced, the manufacturing thereof is easy, and the cost can be reduced. In particular, the case 10 and the cover member 3
0, the cover member 30 and the switch contact member 32, or by molding these three members by two-color molding or insert molding, the manufacturing thereof can be performed more easily.

FIG. 2 shows a push button switch device according to a second embodiment of the present invention and is a partial sectional view thereof. In the second embodiment and other embodiments described later, the same parts as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In the push button switch device according to the second embodiment, the cover member 30 is fixed to the entire back surface of the case 10 by heat bonding or the like, and the key top member 31 made of a hard resin is formed on the surface of the bulging portion 30a of the cover member 30. And the switch contact member 32 is formed of a substantially flat plate member having a projection 32a formed on the lower surface. Key top member 31
Is made of a thermoplastic hard resin such as ABS having a Shore D hardness of 40 degrees or more, preferably the same hard resin as the switch contact member 32, and is fixed to the cover member 30 by heat bonding or two-color molding. . The switch contact member 32 includes the protrusion 3
The projected area S of 2a in plan view is smaller than the projected area Sa of plan view of key top portion 30a (preferably 1/2 or less).
And a shape smaller than the projected area Sb of the upper surface of the contactor 21b in plan view.

In the push-button switch device according to the second embodiment, since the cover member 30 is fixed to the entire back surface of the case 10, higher waterproofness and dustproofness are achieved, and a hard resin key top member. Since 31 is provided, a hard finger touch feeling can be obtained and the operation feeling can be further improved.

FIG. 3 is a partial sectional view showing a push button switch device according to a third embodiment of the present invention. In the push button switch device according to the third embodiment, the cover member 30 has a bulging portion 30a.
Step portion 3 that fits around the edge of the opening 11 of the case 10 around the
0c is formed, and the hard resin molded product 39 is fixed to the bulging portion 30a. The hard resin molded product 39 is formed by integrally projecting a rod-shaped switch contact portion 39b on the back surface of a key top portion 39a having a truncated cone shape.
Stick to the surface of the bulging portion 30a, and the switch contact portion 39b
Penetrates the top surface portion of the bulging portion 30a and projects to the back surface side.
The hard resin molded product 39 is made of a hard thermoplastic resin such as ABS described above, and is covered by the two-color molding.
It is fixed integrally with.

In the third embodiment, the cover member 3
Since 0 is fitted to the edge of the opening 11 of the case 10 at the step portion 30c, higher waterproofness and dustproofness are achieved, and one hard resin molding 39 functions as a key top member and a switch contact member. Therefore, the number of parts can be reduced, the structure can be simplified, the assembling can be performed easily, and the cost can be further reduced. In particular, this third embodiment
Since the molded product 39 and the case 10 are made of the same resin, the molded product 39 and the case 10 can be fixed to the cover member 30 by two-color molding that simultaneously molds the molded product 39 and the case 10, and the process can be shortened. It is possible. The cover member 30 can be fixed to the case 10 by two-color molding or insert molding. However, when the cover member 30 is fixed by an adhesive, the stepped portion 30c of the cover member 30 and the edge portion of the opening 11 of the case 10 are fixed. It is desirable to apply an adhesive between the two.

FIG. 4 is a partial sectional view showing a push button switch device according to a fourth embodiment of the present invention. In this push button switch device, a columnar thick portion 34 is formed on the cover member 30 in place of the bulging portion 30a of each of the above-described embodiments, and a hard resin molded product 39 is fixed to the thick portion 34. In the hard resin molded product 39, as described in the third embodiment, the rod-shaped switch contact portion 39b protruding from the back surface of the key top portion 39a has the large diameter portion 38b at the end, and this large diameter portion Three
8b penetrates the thick portion 34 and protrudes on the back surface side so as to be able to come into contact with the contact 21b.

Further, the cover member 30 has a fitting flange portion 34a formed at the end of the thick portion 34, and a hard resin molded product 39.
A fitting recess 38a is formed on the back surface side of the key top portion 39a, and the fitting flange portion 34a is fitted into this fitting recess 38a. The cover member 30 and the hard resin molded product 39 are molded by two-color molding or insert molding and integrally fixed.

In the fourth embodiment, the cover member 3
0 and the hard resin molded product 39 are molded by two-color molding and firmly fixed, so that the cover member 30 and the hard resin molded product 39
It is possible to reliably prevent the entry of water that has passed through between the cover member 30 and the hard resin molded product 39 and to achieve high waterproofness and dustproofness.
4a and 4a are fitted together, so high durability can be obtained.

FIG. 5 is a partial sectional view showing a push button switch device according to a fifth embodiment of the present invention. In the fifth embodiment, a ring-shaped groove 19 extending around the opening 11 and a plurality of locking projections 18 having enlarged ends are formed on the back surface of the case 10, and a ring-shaped projection 37 is formed on the cover member 30. The locking hole 36 is formed, the projection 37 is fitted in the groove 19, and the locking projection 18 is fitted in the locking hole 36. The case 10, the cover member 30, and the hard resin molded product 39 are fixed to each other, or are molded by two-color molding or insert molding in an appropriate combination and fixed integrally.

FIG. 6 is a partial sectional view showing a push button switch device according to a sixth embodiment of the present invention. In the sixth embodiment, a step 11a is formed on the inner edge of the opening 11 of the case 10, the edge of the cover member 30 is fitted to the step 11a, and the case 10 is annularly formed around the opening 11. A groove 17 is formed, and a protrusion 34a formed in an annular shape around the thick portion 34 is fitted to the cover member 30 in the groove 17, and the thick portion 34 has a projection having a substantially T-shaped cross section. 34e is formed and embedded and fitted in the key top portion 39a. Then, the case 10, the cover member 30, and the hard resin molded product 39 are heat-bonded, or molded by two-color molding or insert molding and fixed integrally.

FIG. 7 is a partial sectional view showing a push button switch device according to a seventh embodiment of the present invention. In the seventh embodiment, a substantially plate-shaped cover member 30 is fitted in the opening 11 of the case 10 such that the front and back surfaces are continuous with the inner and outer surfaces of the case 10, and a hard resin switch contact member 32 is provided on the back surface of the cover member 30. It is fixed. The case 10 and the cover member 30,
The cover member 30 and the switch contact member 32, or the case 10, the cover member 30 and the switch contact member 32 are molded by two-color molding or insert molding and fixed integrally.

FIG. 8 is a partial sectional view showing a push button switch device according to the eighth embodiment of the present invention. In the eighth embodiment, the cover member 30 is attached to the outer surface of the case 10 to cover the outer surface of the case 10, and the cover member 30 has the opening 1 of the case 10.
A hole smaller than the opening 11 is formed concentrically with 1, and a hard resin molded product 39 is fixed to this hole. In the hard resin molded product 39, the key top portion 39a has a plate shape having substantially the same thickness as the cover member 30, and the switch contact portion 39b protrudes through the opening 11 into the case 10 so as to be able to come into contact with the contact 21b. .

FIG. 9 is a partial sectional view showing a push button switch device according to the ninth embodiment of the present invention. In the ninth embodiment, the cover member 30 is molded into a substantially plate shape, and the cover member 30
A plate-shaped key top member 31 made of hard resin on the surface side of the
A plate-shaped switch contact member 32 made of hard resin is buried on the back side so as to expose one surface thereof, and a ridge 36 having a substantially circular cross section is integrally projected on the side surface over the entire circumference. The groove 11d is formed in an annular shape on the inner surface of the opening 11, and the protrusion 36 is fitted into the groove 11d to provide the cover member 30 in the opening of the case 10. Then, the case 10, the cover member 30, the key top member 31, and the switch contact member 32 are fixed to each other by two-color molding or insert molding.

In the push button switch device of the ninth embodiment, the case 10 and the cover member 30 are fixed to each other by fitting the protrusions 36 and the groove 11d, so that the case 10 and the cover member 30 are strong. It is firmly attached to and has high durability,
Further, higher waterproofness and dustproofness are achieved.

Next, a specific example will be described. Concrete examples 1 to 7 corresponding to the above-mentioned respective examples were manufactured under the conditions shown in Tables 1, 2 and 3, and the test items of waterproof / dustproof property, switch reliability, switching operation feel and cost were attached. The results of comparison and comparison with Comparative Examples 1 to 4 are shown in Tables 1, 2, and 3. As is clear from these Tables 1, 2, and 3, the specific examples 1 to 7 of the invention of the present application were superior to the comparative examples 1 to 4, and excellent results were obtained for all test items.

[0037]

[Table 1]

[Table 2]

[Table 3]

Concrete example 1 is the product corresponding to the first embodiment described above, concrete examples 2, 3, 4, 5 are the products equivalent to the second embodiment, and concrete examples 6 and 7 are the products equivalent to the sixth embodiment. Stylak 185 in the table is heat-resistant ABS, GTX66 manufactured by Asahi Kasei Corporation.
01 is PPO manufactured by Japan GE Plastics Co., Ltd.
Alloy of (polyphenylene oxide) and nylon, P
433 RNAT is a polyurethane-based elastomer manufactured by Nippon Miractolan Co., Ltd., and Panlite L-1225 is a polycarbonate resin manufactured by Teijin Chemicals Ltd., Alfaloy MP.
C6801 is a resin manufactured by Kanegafuchi Chemical Industry Co., Ltd., and P75M is a polyester elastomer manufactured by Toyobo Co., Ltd.

In Comparative Example 1, a hard resin key top member and a circuit board are provided with metal contacts, and the key top member is urged by a metal spring. A tact switch is used in place of the metal contact in Example 1, and Comparative Example 4 is equivalent to Prior Art 3 (FIG. 11). However, in Comparative Example 3, as shown in FIG. 10, the switch contact member 32 is replaced with the key top member 31.
It is formed in a shape having a larger plane projected area than that of FIG.

[0040]

As described above, according to the first and second aspects of the invention, the cover main body is fixed to the case at the entire peripheral edge of the opening, so that high waterproofness and dustproofness are achieved. Further, since the cover body is elastically deformed by the pressing operation of the key top portion to obtain repulsion elasticity, a metal coil spring is not required, the simplification of the structure and the reduction of the number of parts are achieved, and the manufacturing cost is low and easy. In addition, a good operation feeling can be obtained, and since the switch contact member that comes into contact with the switch portion of the circuit board is molded from hard resin in a shape having a projected area smaller than that of the key top portion, there is a problem such as double pressing. It can be prevented.

According to the push-button switch device of the third aspect of the invention, since the key top portion is made of hard resin, the operator can obtain a hard finger touch feeling and a better operation feeling can be obtained. Since the key top portion is made of the same resin as the contact member, manufacturing is easy. Further, according to the push-button switch device of the fourth aspect of the present invention, at least one of the key top portion and the contact member is formed integrally with the case by molding the same hard resin. It can be molded integrally with the cover body by color molding, etc., and can be easily manufactured in a simpler process.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a push button switch device according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view of a push button switch device according to a second embodiment of the invention.

FIG. 3 is a partial sectional view of a push button switch device according to a third embodiment of the invention.

FIG. 4 is a partial sectional view of a push button switch device according to a fourth embodiment of the present invention.

FIG. 5 is a partial sectional view of a push button switch device according to a fifth embodiment of the present invention.

FIG. 6 is a partial sectional view of a push button switch device according to a sixth embodiment of the present invention.

FIG. 7 is a partial sectional view of a push button switch device according to a seventh embodiment of the present invention.

FIG. 8 is a partial sectional view of a push button switch device according to an eighth embodiment of the present invention.

FIG. 9 is a partial sectional view of a push button switch device according to a ninth embodiment of the present invention.

FIG. 10 is a partial cross-sectional view of a virtual push button switch device for comparison of operation feelings.

FIG. 11 is a partial cross-sectional view of a conventional push button switch device.

[Explanation of symbols]

 10 Case 11 Opening 11a Stepped portion 19 Groove 20 Circuit board 21 Switch portion 21a Switch body 21b Contact 30 Cover member 30a Swelling portion (key top portion) 30c Stepped portion 31 Key top member 32 Switch contact member 32a Protrusion 39 Hard resin Molded product 39a Key top part 39b Switch contact part

Claims (4)

[Claims] 1. A push button switch device housing comprising a plurality of cases joined together and having a plurality of openings formed in at least one case, wherein a rubber is fixed to the case having the opening at least over the entire circumference of the opening. A cover body made of an elastic material is provided, a key top portion is provided on the surface of the cover body at the opening position, and a contact member made of hard resin is fixed to the back surface of the cover body at the opening position. A housing for a push button switch device, wherein a projected area in plan view is smaller than a projected area in plan view of the key top portion. 2. A push button switch device in which a circuit board having a switch part is housed in a housing formed by joining a plurality of cases, and a plurality of openings facing the switch part of the circuit board are formed in at least one case. The cover main body having rubber elasticity having a key top portion around the opening edge portion of the case fixed around the entire circumference of the case, and having a key top portion protruding outward from the opening of the case on the surface, A contact member which is provided on the back surface so as to be able to contact the switch portion of the circuit board at a position corresponding to the key top portion, and which is made of a hard resin having a projected area in plan view smaller than that of the key top portion. Push button switch device. 3. The push button switch device housing according to claim 1, or the push button switch device according to claim 2, wherein the key top portion is integrally formed of the same hard resin as the contact member. 4. The push button switch device housing according to claim 1, or the push button switch device according to claim 2, wherein at least one of the key top portion and the contact member is integrally molded with the case with a hard resin.